It's not quite as simple as just tossing some seed out. Yes, you will probably get some grass to grow, but it will no doubt be sparse and patchy, prone to weeds, moss and standing puddles unless you do a bit of prep work.

Preparing the seed bed is the most important aspect of planting a lawn and the one that gets consistently overlooked. Because grass seed will grow virtually anywhere, too many never consider this aspect and spend countless hours, lots of effort and buckets of expensive chemical fertilizers or toxic weed killers everafter trying fruitlessly to make it look good. Take the time now to prepare the soil correctly and then yes, growing a lawn is pretty darn easy :-)

Make sure the soil is not compacted - pretty much a given in new construction - and in the process add a good 4-6 inches of 3-way planting mix or compost, as all topsoil has likely been scraped away. Till in to a depth of about 8 inches, 10" if you can manage, rake to grade for a slight slope for good drainage (away from the house!), roll to get out air pockets and you should be ready to go. Select a good NW seed blend. Mid April is a recommended time for seeding here - the soil needs to be at sufficiently warm temps for the seed to have good germination and that doesn't happen until then.

gardengal is right.

And I don't think growing it is as easy as it seems, unless the preparation is done right.

By the way, one of my favorite places to buy turf products and other stuff, was from...

PROFESSIONAL TURF CENTER

It's in Tigard, across Hy. 99 from Fred Meyer. There is a homeowner side and a professional side. They help everybody.